Re: Alternatives to MOVEL - just curious

Vern,

So would this be preferable?


num4 = %dec(%subst(%char(num6):1:4):4:0);

I'm not sure it's more readable at a glance, but if you read through it, I think it's pretty clear that it's saying 'Take the first 4 digits of the 6-digit number and plug them into a 4,0 number'.  I'm not sure how it'll perform, but it can't be worse than division.


Is it worth what you paid for it? <grin>

 
Dave Shaw


________________________________
From: Vernon Hamberg <vhamberg@xxxxxxxxxxxxxxx>
To: RPG programming on the IBM i (AS/400 and iSeries) <rpg400-l@xxxxxxxxxxxx>
Sent: Monday, December 9, 2013 1:32 PM
Subject: Re: Alternatives to MOVEL - just curious


I agree that this works - but it's like the old multiplication technique
to shift date formats. It was a trick, and prone to strange looks until
we knew the trick.

As is the division technique. And there you may have to rely on
precision rules of the calculation.

Of course, as Trevor Briggs said - documentation - comments, right?  :)

Vern

On 12/9/2013 12:20 PM, Booth Martin wrote:

      Num4 = Num6 * .01;

On 12/9/2013 10:31 AM, Vernon Hamberg wrote:

Hi y'all

I'm looking at some code - the purpose is to put the 1st 4 digits of a
6-digit variable into a 4-digit numeric variable.

It is being done with the MOVEL opcode now.

I'm wondering about efficient alternative methods. One I can think of is
to use a data structure -

dcl-ds dsMoveL qualified;
      num4 zoned(4);
      num6 zoned(6) pos(1);
end-ds;

Anything simpler? Better performing?

I hope the syntax is right!! But you get the idea, right?